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Available-for-Sale-Securities
12 Months Ended
Dec. 31, 2017
Available-for-sale Securities [Abstract]  
Available-for-Sale-Securities
Available-for-Sale-Securities
The following table is a summary of available-for-sale securities recorded in cash and cash equivalents in our Consolidated Balance Sheets (in thousands):
 
December 31, 2017
 
December 31, 2016
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Corporate debt securities
$
42,701.0

 
$

 
$
(28.0
)
 
$
42,673.0

 
$

 
$

 
$

 
$

Money market funds
9,211.5

 

 

 
9,211.5

 
4,426.8

 

 

 
4,426.8

Total
$
51,912.5

 
$

 
$
(28.0
)
 
$
51,884.5

 
$
4,426.8

 
$

 
$

 
$
4,426.8



Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale debt securities on our Consolidated Balance Sheets (in thousands):
 
December 31, 2017
 
December 31, 2016
Cash and cash equivalents
$
25,967.8

 
$
4,426.8

Marketable securities
25,916.7

 

Total
$
51,884.5

 
$
4,426.8



The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
 
 
December 31, 2017
 
Amortized Cost
 
Estimated Fair Value
Less than one year
$
51,912.5

 
$
51,884.5

Greater than one year

 

Total
$
51,912.5

 
$
51,884.5